This is a simple clasp for Paracord that is designed to release with pressure to avoid being strangled if the lanyard is grabbed or snags. Created for Lifeguard whistles.

This design was created with openscad and is fully parameterized.  This means it is simple to change dimensions and create you own design.  The included STL is as small as I could make the clasp and still be able to print and assemble the lanyard.  A logo can also be added to the slider.

Assembly is simple.

Cut a length of paracord (550 cord), around 36 inches (90 cm) works for me. Prepare the ends by lightly burning. Thread through optional slider. Put one clasp end on each end of cord with the joint to the end and slide on far enough to avoid heat as the end is melted further. Do not knot the ends, Melt the ends into a small mushroom. Now pull the mushroom into the clasp to secure. The clasp ends will be hard to push together depending on your 3d printer settings. Pull on cord to release the clasp. It should release with a nice pop. If the cord pulls out of the clasp you will have to melt it a bit more.